How to get eligible shipping service list in amazon mws api?

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C#

ASP.NET

When i am doing code for get eligible shipping service list on particular order of Amazon Mws, then i got only "

TemporarilyUnavailableCarrierList

" .
In shippingservicelist count shows "zero".

Don't know how

What I have tried:

GetEligibleShippingServicesRequest shippingServicesRequest = new GetEligibleShippingServicesRequest();
                            shippingServicesRequest.SellerId = "";
                            shippingServicesRequest.MWSAuthToken = "";
                            shippingServicesRequest.ShipmentRequestDetails = srd;

                            GetEligibleShippingServicesResponse shippingServicesResponse = new GetEligibleShippingServicesResponse();
                            shippingServicesResponse = mwsclient.GetEligibleShippingServices(shippingServicesRequest);